The VT320 is an ANSI standard computer terminal introduced by Digital
Equipment Corporation (DEC) in 1987.[1] The VT320 is the text-only
version, while the VT330 adds monochrome ReGIS, Sixel and Tektronix 4010
graphics, and the VT340 adds color.

The VT320 was replaced by the VT420 in 1990, but the VT340 remained in
production until all of these models were replaced by the VT500 series
in 1994.